Preloads between n and n+3 thumbnails at a time
Preloads between n and n+3 thumbnails at a time

The previous algorithm was loading between n and n * 4 thumbnails and had n set at 20.
n is now set at 6, but can easily be set to any value
desaintmartin/gallery,viraj96/gallery,setnes/gallery,owncloud/gallery,tahaalibra/gallery,imjalpreet/gallery,leftees/galleryplus,imjalpreet/gallery,desaintmartin/gallery,owncloud/galleryplus,tahaalibra/gallery,interfasys/galleryplus,owncloud/galleryplus,desaintmartin/gallery,efueger/galleryplus,interfasys/galleryplus,interfasys/galleryplus,patman15/galleryplus,setnes/gallery,efueger/galleryplus,patman15/galleryplus,leftees/galleryplus,owncloud/gallery,setnes/galleryplus,imjalpreet/gallery,setnes/galleryplus,owncloud/gallery,patman15/galleryplus,setnes/galleryplus,leftees/galleryplus,tahaalibra/gallery,IATkachenko/gallery,IATkachenko/gallery,viraj96/gallery,IATkachenko/gallery,setnes/gallery,viraj96/gallery,owncloud/galleryplus